Concrete foundation and method of making same



w. H. PA-vm, 1H. CONCRETE FOUNDATION AND METHOD 0F MAKING SAME.

APPLICATION FILED NOV.15,v19l9.

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l uNlrlazD STATES PATENT OFFICE.

, WILLIAM-H. rAvITT, Jn., or BROOKLYN, NEWYOJMLv CONCRETE FOUNDATION AND METHOD on `ivrAKINdsimian.

Specification of `Letters Patent. afented ulyv 12,1921. i

Application inea November i5, 191e.' serial [Nm 338,374.

To all whom t may concern.' VBe `it known that I, VILL'IAMH. PAvITT, Jr., a citizen of theUnited States, and resident of Brooklyn, inthe county of Kings f My present invention comprises improvements 1n the form ofand .method of con-vv structing concrete foundations for coke Ovens and for other apparatus and structures where relatively larger foundations.,

carrying heavy` loads are required; Iand the general object/of theinvention is toprovide for the construction of afounda'tion of this character which shallpossess ample strength on the one hand, and on the other hand is relatively easy and inexpensive to construct. The various features of novelty which characterize my invention are set forth in the claims annexed to and forming a part of this specification. For -a better understanding of the invention however, reference should be had to the accompanying drawings and descriptive matter in which I have illustrated and described a preferred construction and method of making the same.

Of the drawings:

Figure lis a plan of a partially completedv foundation; and

Fig. 2 is a section on the broken line 2-2 of Fig. 1.

rIhe foundation shown as partially constructed in the drawings, comprises a base or bed layer of concrete A, concrete columns or posts B rising from the base A, a cap layer `C of concrete carried by the columns B, and earth filling D filling the space surrounding the columns B and extending be- "tween the base and the cap layer C.

Advantageously the layers A and C are connected at their edges as shown in the drawings, by a vertical concrete wall E.

In constructing the foundation described, the first step will ordinarily be to excavate the earth on the foundation site to a suiiicient depth tol reach a sub-soil stratum of sufficient bearing strength to support the foundation and its load. The next step is to form the foundation layer A of concrete. This may be done in the usual manner. Preferably short, vertical reinforcing bars G are put in place in the layer A at the points where the columns B are to be subsequently, erected.- ,After the layer yAis' in',

place, the columns B andthe wall'E are formedI The columns IB are vpreferably cylindrical, and the ease and relative inexpensiveness with which these may be formed in practice, and the'simple and effective l character, of theA molds in which they are formed, constitute important characteristics of the invention.' Breferably, reinforcing bars H are inserted in the upperends of the columns B as shown. After the columns B and the wall Eare formed, the space surrounding the columns is `filled with earth D to the `level `of the under side of the cap layer C and the latter is then formed. The

earth filling D, which should be sufficiently compacted foi the purpose, supports the material forming the 'layer `'A while the latter is plastic and-is not supported bythe wall E and columns B.

It will be understood, of course, that in the finished foundation, the parts B and the wall D are integrally connected to the base and to the cap layers A and C.

In practice the foundations may well be formed in successive horizontal sections, .so that the earth E, as excavated to provide the site for a section of the base layer A, may be thrown back between the columns B formed on a previously built section of the base layer A. This makes unnecessary more than one handling of much of the earth l' which must be excavated.` In practice also.l the tops of the columns B as formed will be a few inches above the bottom level of the cap layer C.

The foundation formed in the manner described, is simple and strong. While the earth filling D cannot be relied on to carry any portion of the vertical load on the cap layer C, it gives lateral stability'vto the columns B and thereby materially strengthl filo" In such cases a foundation may be constructed in accordance with the present. in-

inthe form of the apparatus and of the vention for a substantially lower cost than can a foundation for the same purpose made by driving piles and capping the piles or made of a solid massof concrete.

For example, a single coke oven battery foundation', of the not unusual `dimensions' crete.

A Vhile in accordance withthe provisions of the statutes lI have illustrated and describedV the best form of my invention now known to me, it lwill be apparent to those skilled in the art that changes may be made mode of constructing it disclosed, Without departing from the spirit of my invention as set forth in theappended claims.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. The method of forming an extended.

concrete foundation which consists in forming a concrete base layer, erecting spaced apart concrete postsl on said layer, filling the space surrounding said posts with earth, and forming a cap'layer of concrete on said postsI and the earth filling about them.

2. A concrete foundation comprising a lconcrete base layer,spaced apart concrete posts rising from, an integrally connected to said base layer, a cap layer of concrete mounted on, and integrally connected to said posts, anda filling of earth about said posts adapted to serve as a support for the portions of the cap layer between the posts in forming'the cap layer, and to give lateral stability to said posts.

Signed at New York, in the county of New York and State of New York, this twelfth day of November, A.D. 1919.

WILLIAM H. PAVITT, JR. 

